I bought it ahead of an eight-hour train journey a couple of years ago. Truth be told, I didn't think it was that good. The GBA was inundated with great platformers, and this, to me, wasn't one of them - it just came off as serviceable.
Definitely, absolutely, completely, utterly and totally download the original off of PSN. Even allowing for technological limitations, Empire of Dreams has nothing on Door To Phantomile.